= Multiwire proportional chamber
= MWPC
{c}
{synonym}
A <multiwire proportional chamber> is a <proportional counter>: parallel <anode> wires between <cathodes> in a <gas>. <Charged particle> <ionization> frees <Electrons>; an <electric field> drives them toward wires, triggering an <electron avalanche> read by <electronic amplifiers>.<Electronic Imaging of Ionizing Radiation with Limited Avalanches in Gases by Georges Charpak>[pp. 24–27, Figs. 1–5]{ref}
<Georges Charpak>'s electronic readout avoided film scanning and full <spark chamber> discharge.<Electronic Imaging of Ionizing Radiation with Limited Avalanches in Gases by Georges Charpak>[pp. 23–24]{ref}
\Image[/multiwire-avalanche-electronic-readout.png]
{title=From <gas> <ionization> to an electronic wire address}
{description=Original functional schematic; dimensions, pulse shapes and routing are illustrative. Wire cross-sections face the viewer.}
Opposite polarities identify the avalanche wire. Positive <ion> motion dominates integrated signal; detection precedes complete collection. Calibrated <Electron> travel times enable <drift chambers>.<Electronic Imaging of Ionizing Radiation with Limited Avalanches in Gases by Georges Charpak>[pp. 26–28]{ref}
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